Hey all, I've been using this tactic in a spreadsheet (=getgadata formulas) on my PC for weeks using Excel 2004, but recently got a Mac with Excel 2011 and the formulas aren't updating. Any idea how to fix?

If I am not mistaken, Criteo's pricing is almost exclusively on a PPC basis. Unlike the vast majority of retargeters, Criteo assumes a big chunk of the risk. I believe they are the largest retargeter in Europe and have something close to a 95% renewal rate.